Orban OPTIMOD-FM 8700, Operating Manual

Page: 280 / 390

4-4
MAINTENANCE ORBAN MODEL 8700i
screw partially blocked by the rotary encoder’s knob, use a small screwdriver and
attack the screw head from a slight angle, avoiding the edge of the knob to pre-
vent cosmetic damage.
The pushbutton switches, joystick, and rotary encoder are all soldered to this
board and can be replaced by normal solder rework techniques.
8. Removing the Color LCD Display and carrier board.
A) Make sure that AC power is disconnected from the 8700i.
B) Remove the cable assembly from J14 on the base board.
C) Remove the 33-conductor flat ribbon cable from the display interface board at
J103:
a) Carefully disconnect the cable by rotating the black “wing” at the rear of
the connector 90° from horizontal to vertical.
b) Slide the cable out of the connector.
You may find it easier to first remove the display interface board from
the CPU board stack.
D) Remove the four screws that hold the display carrier board to the standoffs on
which it is mounted. Then lift the assembly off the standoffs.
9. Removing the RS-232 Connector Board:
A) If you have not done so yet, remove the top cover (step 1, above).
B) Using a 3/16-inch hex nut driver, remove the six hex nuts holding the RS-232
connectors to the chassis.
C) Unplug the RS-232 interface assembly from the base board.
10. Removing the CPU board.
The Display Interface Board and CPU Board are a “sandwich” assembly. The CPU
board is located on top of the Display Interface Board and is plugged into it.
A) Make sure that AC power is disconnected from the 8700i.
B) Remove the RJ45 network cable from the CPU board
C) Remove the four Phillips screws from the CPU board.
D) Carefully unplug the module by pulling it evenly away from the display inter-
face board.
11. Removing the Display interface Board.
You must first remove the CPU board before removing the Display Interface
Board.
A) Unscrew the four standoffs that had supported the CPU board before it was
removed.
B) Carefully pull the Display Interface Board evenly away from the Base Board,
being careful not to stress any ribbon cables still connected to it.